Reproducer for graphophones.



, V H. EMERSON.

REPRODUCER FOR GRAPHOPHONES.

' APPLICATION IIL ED 3.15, 1905.'

. Patnted May 14, 1912.

Fig. 2

UNITED STATES PATENT OFFICE.

vrcroa H. EMERSON, on NEW YO K, N. Y., AssIeNoa'ro AMERICAN GRAPHOPHONE COMPANY, or BRIDGEPORT, CONNECTICUT, A CORPORATION or WEST VIRGINIA.

anrnonuona Foit GRAPHoPI-Io-NES.

To all whom it may concern:

Be it known that I, VICTOR H. EMERSON,

a citizen of the United States, and a resi-' dent of New York city, New York, have invented a new and useful Reproducer for Graphophones, which reproducer is fully or more grooves and giving imperfect reproductions.

I .One ob ect of the present invention is toprovide a talklng-maclnne in which VQItlcally undulating disk records may be em ployed that will properly feed the soundbox. Again, disk records have heretofore required a fresh stylus (or needle for each reproduction, whereas cylinder records (with their vertically undulating grooves) employ the same stylus over and over again. By applying the vertically undulatingrecord to a disk tablet, and by giving the groove the proper configuration, I am enabled to accomplish the combined resultsof both feeding the sound-box across the disk and of using the same needle for all reproductions. In the third place, if the ordinary reproducing stylus employed in cylinder machines be used with a vertically undulating groove deep enough to feed it, the stylus will not enter the more minute irregularities, and the reproduction will be correspondingly defective.

Another object of my invention, then, is to provide, in connectionnvith a record groove capable oat feeding the sound box, a stylus that will give faithful reproductionsfrom such record-groove.

The invention will be best understood by referring to the accompanying drawings which illustrate the same. t

Figure l is a cross-section, greatly. enlarged, representing a recording-tablet and the recording-stylus used in the present in- Speoification of Letters Patent. Patented Ma 14 1912 Application filed April 15, i

1905. Serial No. 255,802.

vention, showing my reproducer in connec-.

tion therewith; and Fig. 3 is a plan view of a disk tablet, partly broken away, showing the position of the reproducing-stylus.

in connection therewith.

In making the record an angular or V- shaped recorder A is employed, which is connected with the diaphragm of a suitable sound-box in such a manner asto vibrate vertically in operative relation to arecording tablet B which is caused to rotate beneath. the stylus A in the well known manner so as to receive a spiral groove. At a, a" are represented the two sharp edges of the recorder A. These are shown as straight edges that converge at a right angle each lying at an angle of 45-to the surface of the tablet B; but this angle may be more acute, or more obtuse,, and instead of converging to a point, there maybe more or less curvature or rou-ndness. Obviously, the stronger the'impulse imparted t'o the diaphragm that actuates stylus A, the deeper wlll be the cut made into the record by the recorder, but the cross section of the cut at any place will always be the same as the profile of the'recorder A. At 6, b, b", are illustrated cuts or grooves of dilierent depths.

The disk record B, in Fig. 3, may be obtained from the originalrecord 13 (Fig. 1) by the well-known Jones process set forth in Patent No. 688,739, granted Dec. 10, 1901, to Joseph W, Jones "at al. My new reproducingstylus C is shown as presented at an angle of 45 to the surfaoeof tablet B, being secured in any convenient manner I the recording-stylus for cylindrical records.

'If the cross-sectionof the sound-groove shows two straight sides converging at a right angle, then the flat base of the cylinder 0 will rest against one side, and one element of the cylinder will rest against the other side of the cut; and, no matter how deep or how shallow any portion of the cut may be, since the sides of the cut are always at (substantially) the same angle,

' the st lus will always enter the cut to the full Fepth of the latter, consequently, a faithful -reproduction will always be ob ta-ined. Furthermore, since these cuts are not the shallow, rounded affairs heretofore constituting record-grooves of this type, the stylus C will be fed withoutany danger of skipping. v

If the cross-section of the record-grooves does not show an exact rightangle, the

lower end of the stylus C may be more or less varied accordingly, as may be obvious, but the same benefits will be obtained in a greater or less degree.

Fig. 3 shows the stylus C as lying in the vertical plane through'a radius of the disk groove.

Havin thus described my invention fully, I 531m;

1. The combination of a tablet havin a spiral sound-groove the walls of which groove converge at an angle, anda stylus presented transversely of said groove and at less than a right angle to said tablet, the end of the stylus engaging one wall of the groove and the side of the stylus engaging the other wall of the groove.

- 2. The combination of a disk tablet having a spiral sound-groove characterized by vertical irregularities, a diaphra 1n, and a stylus entirely supported by said iaphragm and lying in the vertical plane through a radiusof said disk, said stylus being presented at an angle of approximately 45 to the surface of the disk.

3. In a talking machine, the combination of a tablet containing a vertically undulating sound-groove whose walls converge at an angle of approximately 90, and a reproducing stylus Whose-end face engages one wall of the groove and whose side engages the other wall of the groove.

4;. The combination of a disk tablet having a spiral sound groove characterized by vertical irregularities, a diaphragm, and a stylus entirely supported by said diaphragm and lying in the vertical plane through a radius of said disk.

Intestimony whereof I have signed this specification in the presence of two subscribing witnesses.

VICTOR H. EMERSON. \Vitnesses i v G. A. MANWARING,

WM. HAOKLAND. 

